S.A.Clementz.The northern lights in the Samara province, Nikolaev district in 1870 and 1871.Manuscript material.

S.A.Clementz.The northern lights in the Samara province, Nikolaev district in 1870 and 1871.Manuscript material.- 1870. -Agreement No. 24 of 02/12/2016 category 34 manuscripts of the works of members of the Russian Geographical Society and separate documents in the Samara province, case 34..Electronic copy source: PB